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Yazidi women raped and sold by ISIS. Photojournalist: Alex Platt

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Former ISIS slaves describe their ordeal at the hands of militants who raped them, "passed them on" to their friends

The women say captives who were found to be pregnant were forced to undergo abortions

"If the girl said, 'I don't want to come with you,' they would take [her] by force, says escaped sex slave Noor

Watch Connect the World at 5 p.m. CET this week for detailed reports on Yazidis enslaved by ISIS and their lives now.

Dohuk, Iraq (CNN)ISIS militants forced pregnant women they had sold into slavery to have abortions, according to three young Yazidis who escaped from the Islamic militants' brutal clutches.

After abducting hundreds of young women and girls from their homes in Iraq's Sinjar province last August, ISIS fighters rounded the captives up in "slave markets" where they were picked out to be used for sex.

The terror group was so intent on using rape as a weapon of war that they brought in their own doctors -- gynaecologists -- to determine which of the women they had captured were virgins.

Bushra, 21, says she witnessed two doctors invasively examine girls to find out if they were already pregnant. Those found to be expecting were forced to abort their babies.

"One of my friends was pregnant," Bushra recalls. "Her child was about three months in the womb. They took her into another room. There were two doctors and they did the abortion.

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"Afterwards, they brought her back. I asked her what happened and how they did it. She said the doctors told her not to speak."

Bushra says the abortion left her friend bleeding heavily, and in so much pain that "she could not talk or walk."

Photos:Fleeing ISIS: Life for Yazidi child refugees

Photos:Fleeing ISIS: Life for Yazidi child refugees

The Sharia Camp in Dohuk, Iraq houses 18,575 people in 4000 tents. It opened in 2014 and includes four schools -- two Arabic, two Kurdish. Many residents have escaped from their home in Sinjar after ISIS invaded and captured many Yazidis. Three-year-old Farhad Naifg is from Sinjar. He has been living in the camp for a year.

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Photos:Fleeing ISIS: Life for Yazidi child refugees

Two-year-old Basman Haidar and his grandfather Haidar Kharmish, have also spent a year in the camp.

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Photos:Fleeing ISIS: Life for Yazidi child refugees

9 year-old Katrine Hamou and her two-year-old brother Zimar Hamou are from Sinjar.

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Photos:Fleeing ISIS: Life for Yazidi child refugees

Three-year-old Muna Rasho is from Sinjar. She came to the camp a year ago with her three brothers and two sisters.

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Photos:Fleeing ISIS: Life for Yazidi child refugees

Marwa Khalil, who is eight years old, escaped from Sinjar with her family. She suffers from a skin disease and can't go to school because other children refuse to sit next to her.

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Photos:Fleeing ISIS: Life for Yazidi child refugees

Miada Murad is eight years old, from Sinjar. She has five sisters.

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Photos:Fleeing ISIS: Life for Yazidi child refugees

Gawre Murad, 40, and her son Aryan, four, escaped from Sinjar a year ago.

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Photos:Fleeing ISIS: Life for Yazidi child refugees

Shami Ravo Hussain, left, and Gozi Haji, right, fled when ISIS came to their village Siba Sheikh Khidir, near Sinjar.

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Photos:Fleeing ISIS: Life for Yazidi child refugees

Gule Rasho, 23, and her son Rami, 11 months, also escaped from Siba Shekh Khidir.

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"She was the first. After that, they took the pregnant women and put them in a separate house."

Noor, Munira and Bushra say they were abducted when fighters stormed their villages; separated from their families and spirited away to ISIS controlled regions of Iraq, they were forced into sex slavery.

The refugee camps of Dohuk are filled with stories like theirs, of women and girls bought and sold, given as gifts, or bartered for weapons.

Bushra says she was living a "normal ... interesting ... good life," until ISIS arrived in Sinjar and tore her away from everything she knew.

"They told us, 'Give up your family, give up that you are Yazidi -- you are now Muslims. We are going to marry you; each fighter will have one of you.'"

Lined up for "inspection," Munira, 16, says the militants examined the "belly, teeth, breasts" of her and the other captives before choosing who they wanted as a "wife."

"If the girl said, 'I don't want to come with you,' or 'I don't want to marry you, they would take [her] by force," remembers Noor, 22. "There was no other choice.

"One man picked me. He was old, ugly and fat. I was so scared. There were some other ISIS fighters so I begged one of them, 'Please, take me. Take me anywhere and marry me, if you want, but take me away from this one.' So he did."

The Yazidis, a small Iraqi minority who believe in a single god who created the Earth and left it in the care of a peacock angel, have been subjected to large-scale persecution by ISIS, which accuses them of devil worship.